Silica coated magnetic NiFe₂O₄ nanoparticle supported phosphomolybdic acid; synthesis, preparation and its application as a heterogeneous and recyclable catalyst for the one-pot synthesis of tri- and tetra-substituted imidazoles under solvent free conditions

Abstract

In this research, a magnetically-recoverable catalyst (NiFe 2 O 4 @SiO 2 -H 3 PMo 12 O 40 ) was prepared by supporting phosphomolybdic acid (H 3 PMo 12 O 40 ) onto silica-coated NiFe 2 O 4 nanoparticles. The prepared sample was characterized by FT-IR, TEM, SEM and VSM techniques and then the catalytic activity of this catalyst was investigated in the synthesis of tri-and tetra-substituted imidazole derivatives. More importantly, the catalyst was easily isolated from the reaction mixture by a magnetic bar and reused at least ten times without significant degradation in its activity.

Synthesis and characterization of nanocrystalline hydroxyapatite and its catalytic behavior towards synthesis of 3,4‐disubstituted isoxazole‐5(4H)‐ones in water

“…In continuation of our previous researches on the design and application of heterogeneous and reusable solid catalysts in organic synthesis and MCRs, here we report an efficient and green method for the synthesis of 3,4‐disubstituted isoxazole‐5(4H)‐ones catalyzed by HAp nanoparticles (Scheme ).…”

Facile One‐pot Synthesis of Arylsulfonyl‐4H‐pyrans Catalyzed by Ru Loaded Fluorapatite

“…In recent years, heterogeneous catalysts have received ample attention because of their distinctive possessions such as, huge and responsive surface areas, recyclability, stability, higher selectivity, simple separation and environmentally benign nature . Due to green principles and high efficiency, heterogeneous catalysts have been widely used in various procedures of organic transformations and heterocyclic synthesis .…”

Magnetic Co‐doped NiFe2O4 Nanocomposite: A Heterogeneous and Recyclable Catalyst for the One‐Pot Synthesis of Benzimidazoles, Benzoxazoles and Benzothiazoles under Solvent‐Free Conditions

“…Furthermore, recently heterogeneous catalysts, especially magnetic nanoparticles, have aroused considerable interest in organic synthesis . These magnetic nanoparticles can be easily separated and recycled from the reaction medium by an external magnet.…”